#include<stdio.h>
#include<stdlib.h>
typedef struct listnode {
	int data;
	struct listnode* next;
}list;
list* hlist() {
	list* head = (list*)malloc(sizeof(list));
	head->data = 0;
	head->next = NULL;
	return head;
}
int main()
{
	
	return 0;
}